Exercise TestErgometryExerciseHeart RateBicyclingHead Protective DevicesOxygen ConsumptionMaximal Voluntary VentilationExercise TolerancePulmonary Gas ExchangePhysical ExertionWheelchairsPhysical EnduranceArmCraniocerebral TraumaPhysical FitnessSportsPhysical Education and TrainingRestExercise TherapyLegCardiac OutputQuadriplegiaRespirationRespiratory Function TestsAccidents, TrafficLactic AcidTransportationDyspneaCardiovascular Physiological PhenomenaBlood PressureParaplegiaPulmonary VentilationHemodynamicsAccident PreventionRunningMuscle, SkeletalWalkingEnvironment DesignTime FactorsEnergy MetabolismCross-Over StudiesWounds and InjuriesCarbon DioxideStroke VolumeRegional Blood FlowOxygenSpinal Cord InjuriesDouble-Blind MethodForced Expiratory VolumeTheftProtective DevicesPulmonary Disease, Chronic ObstructiveSafetyAnalysis of VarianceReproducibility of ResultsOff-Road Motor VehiclesAthletic InjuriesSupine PositionRenewable EnergyStrikes, EmployeeMotor VehiclesPublic FacilitiesLungMotorcycles